Kitchen sink



FIG. 1 is a front right side perspective view of my new kitchen sink;

FIG. 2 is a front elevation;

FIG. 3 is a rear elevation;

FIG. 4 is a left side elevation;

FIG. 5 is a top plan view; and,

FIG. 6 is a bottom plan view. 

The ornamental design for a kitchen sink, as shown and described. 